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A032623 Numbers n such that n concatenated with n + 8 is a prime. 1

%I

%S 1,3,13,15,21,39,49,55,69,75,91,111,115,159,163,165,169,171,183,193,

%T 195,199,201,205,211,229,235,241,249,265,271,273,289,291,309,313,319,

%U 321,325,331,333,349,351,355,363,379,381,385,391,393,405,423,441,445

%N Numbers n such that n concatenated with n + 8 is a prime.

%Y Cf. A032613.

%K nonn,base

%O 1,2

%A _Patrick De Geest_, May 15 1998

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Last modified November 18 14:59 EST 2019. Contains 329262 sequences. (Running on oeis4.)